Fastening device.



F. H. RICHARDS. FASTENING DB APPLICATION FILED n Patented Apr. 12, 1910.

Wit/z esses v $7M? the recess 15, which faces in a direction op positethe said inner or abutment engaging face of the hub. The walls of recess14 will afford a reaction abutment for the screw head for holding itagainst the abutment face constituted by the walls of the recess 15 andwill enable it to hold the face of the hub against the abutment faceupon the shaft.

In the form of the device shown in Fig. 7, a screw 16 is shown providedwith a cylindrical instead of a tapered head, fitting a correspondingrecess 14, 15. The inner wall 15 of the portion 15 of the recess lies inthe plane outside of an inner wall 14 of the portion 14. The undersideof the screw-head therefore contacts with this inner wall of the hubrecess and holds it back against the shoulder on the shaft, while thefit of the screw-head in the recess lying in both shaft and hub locksthem against turning relatively to each other.

It will be seen that this device furnishes a simple and easily made, yetsecure, means for fastening small parts of machinery together, which maybe readily detached and, when again fastened together, will assume thesame relative position as before. These features render it of particularvalue in connection with machines of precision.

Having thus described my invention, I claim 1. The combination with anouter element provided with a recess and a one piece inner elementprovided with a mating recess ex tending from one side past its axis,both of whichrecesses when the elements are combined forming a recesshaving an expansible wall, of a screw threaded into said inner elementand having a tapered head within the said recess.

2. The combination with a shaft provided with a recess of circularformation entering one of its sides and extending beyond the axis ofsaid shaft, a hub having an eye for surrounding said shaft and having arecess mating with the recess in the shaft and constituting a singlerecess of circular outline, and a locking member seated within saidcomplete recess and adapted to expand the walls of the same and havingsecurement to one of said members only.

3. The combination with a shaft member and a hub member, the shaftmember being provided with a recess extending into its side at its end,an abutment face facing such end and a tapped hole extending into theshaft from the bottom of the recess, the walls of the recess comprisinga reaction face, the hub having a face for engaging such abutment faceand a recess for mating with the recess in the shaft and an abutmentface facing in a direction opposite the said abutment engaging face; ofa locking member having screw threaded connection with said tapped holeand seated in said recesses and having a face for engaging the abuttingface in the recess in the hub and the reaction face in the recess in theshaft and forcing the abutment face on the shaft and the abutmentengaging face on the hub into engagement.

4. The combination with a member provided with a flexible portion and aportion adjacent thereto relatively inflexible, said relativelyinflexible portion being provided with a tapped hole, a membersurrounding said flexible portion, a recess being provided between saidflexible portion and the opening of said member surrounding it in linewith said tapped hole, and a fastening member having a screw threadedportion for entering said tapped hole, and a locking portion for seatingin said recess upon being screwed into said hole for flexing the partstogether into a tense condition of rigidity.

FRANCIS H. RICHARDS.

Witnesses FRED. J. Donn, C. E. Voss.

